[Rcpp-devel] What is the best practice to expose a C st ructure from 3rd party library into R?

[Wush Wu]

Thanks for your suggestion, Dirk.

I'll try to rewrite Rhiredis based on your approach and provide a similar
rredis interface. If everything is good, I'll try to make it on CRAN if it
is possible.


2013/7/24 Dirk Eddelbuettel <edd at debian.org>

>
> Hi Wush,
>
> After some more cleanup and consolidation, the package is now down to this:
>
>    edd at max:~/git/rhiredis$ tree .
>    .
>    ├── demo
>    │   ├── 00Index
>    │   └── simpleRedisClient.R
>    ├── DESCRIPTION
>    ├── LICENSE
>    ├── man
>    │   └── rhiredis.Rd
>    ├── NAMESPACE
>    ├── R
>    │   └── redis.R
>    ├── README.md
>    └── src
>        ├── Makevars
>        └── Redis.cpp
>
>    4 directories, 10 files
>    edd at max:~/git/rhiredis$
>
> One C++ file declaring a simple class, and the Rcpp modules declaration,
> all
> in about sixty lines -- see details at
>    https://github.com/eddelbuettel/rhiredis/blob/master/src/Redis.cpp
>
> The R file is just one line ensuring the module gets loaded.
>
> The demo/ script show how to use it:
>
>    edd at max:~/git/rhiredis$ cat demo/simpleRedisClient.R
>    #!/usr/bin/Rscript
>
>    suppressMessages(library(rhiredis))
>    print(Redis)   # prints the Module's docstrings
>
>    redis <- new(Redis)
>    redis$exec("PING")           # simple PING -> PONG test
>    redis$exec("PING")
>
>    redis2 <- new(Redis, "127.0.0.1", 6379)   # create 2nd instance
>    redis2$exec("SET testchannel 42")         # write some data
>    redis2$exec("GET testchannel")            # retrieve
>
> You can use any Redis command just by concatenating strings, that should
> also
> work for serializing arbitrary R objects into (raw) strings and back.  More
> user-level work could be done here.  My main focus was to provide the
> simple
> C++ class wrapping everyhing --- without any explicit pointers, smart or
> old-fashioned and not one new/delete.
>
> The C++ file is simple too at just sixty line, see
>
>
> Hope this helps, and thanks for suggesting the Redis wrapper via hiredis.
>
> Hope this helps,  Dirk
>
>
> --
> Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.r-forge.r-project.org/pipermail/rcpp-devel/attachments/20130730/807ec12d/attachment.html>